Western intelligence services consider Russian Federation as a leading suspect, based on previous attacks that used a similar substance and method, a Western intelligence official told CNN. The official cautioned the investigation was still in its early stages. "A number of those had been through the hospital treatment process, there have been blood tests and they're having treatment in terms of support and advice".

Former Russian Colonel, #Sergei Skripal, 66, and his daughter, Yulia, 33, are in a British hospital clinging to life as medical scientists work toward figuring out what they both were exposed to. They believe the pair were deliberately targeted.

Britain will respond appropriately if evidence shows Moscow sponsored a nerve agent attack on a Russian ex-spy and his daughter in southern England, Prime Minister Theresa May says in her strongest warning to date.

She added police needed to be given space "to do their investigation".

A military convoy arrived at the small building close to Salisbury District Hospital and police cordoned off a road.

The grave of Mr Skripal's wife Liudmila, who was buried in 2012, and the memorial stone of his son Alexander, who was cremated previous year, were cordoned off at the London Road cemetery.Apparent fears of chemical contamination have also seen Mr Skripal's home cordoned off while detectives attempt to pin down the origins of the substance used to incapacitate him.

Wiltshire county's acting police chief Kier Pritchard said "around 21 people" including the Skripals have received medical treatment as a result of the nerve gas attack.

The military have been drafted in as part of the investigation (Picture: Getty) Police have said that military assistance will continue as long as is necessary.

Salisburyspy: How will United Kingdom respond if Russian Federation was behind nerve agent attack? However, British Foreign Secretary urged "not to jump to conclusions". The police qualify the incident as an assassination attempt.

Alfredo Morelos signs new deal at RangersEveryone wrote us off at the start of the season but I think we've done well so far. We've won nine out of the last 10 and we're looking to get another good result".

Sergei Skripal was a former Russianspy working for MI6Who is Sergei Skripal?

The former spy was sentenced to 13 years in prison, after Russian Federation claimed he was paid $100,000 to extract classified information and state secrets. People have been so kind and he has expressed that he will never forget that kindness. Here's everything you need to know about the ex-spook.

Home Secretary Amber Rudd said the attack is an "outrageous crime" and a "brazen and reckless act".

"As the immediate shock and concern regarding the incident recede and we reflect on what has happened, I suspect that these feelings we hold will give way to a genuine anger at the audacity of what has taken place within our city", Glen said on his official Facebook page.

Sarin was used in the 1995 attack on the Tokyo subway, carried out by the Aum Shinrikyo doomsday cult, which killed 13 people and injured 5,500 others.

Highly toxic and banned in nearly all countries, nerve agents require expertise to manufacture - leading some to suspect whoever poisoned Skripal had the backing of a state.

The incident is drawing comparisons to the case of Alexander Litvinenko, a Russian KGB officer-turned-British intelligence agent and a highly public critic of President Vladimir Putin.

Kremlin foreign ministry spokeswoman Maria Zakharova told reporters the story "was straight away used to boost an anti-Russian campaign in the media".

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